Atti vs GPS.

I've notice a lot of people saying going into ATTI allows for a higher top speed. I played with this a lot and have found no difference whatsoever. Anyone else found ATTI doesn't change top speed? Any tips to get it working more effectively??

I think the difference has changed in recent firmware updates--which one I'm not sure. But, a couple months ago, I tested the difference and found no significant difference in speed.

This past weekend, (while shooting a friend's sailboat) I discovered that in GPS mode, I no longer get the benefit of a tail wind (like I used to a couple months ago), as it keeps the ground speed at around 35-37 mph regardless. I switched over to ATTI, and my ground speed went up to 55mph (thanks to a 20mph tail wind).

I still see no difference in speed when wind is not a factor. I think many people think they're getting faster speeds, because ATTI isn't automatically correcting for any cross-wind component they're constantly exposed to (unless flying exactly into or with the wind), thus have more apparent speed in the direction they're moving in. However, if one was to maintain the exact COURSE (as one simply gets when maintaining HEADING in GPS mode); you don't get any significant difference in ground speed.

I discovered that in GPS mode, I no longer get the benefit of a tail wind (like I used to a couple months ago), as it keeps the ground speed at around 35-37 mph regardless. I switched over to ATTI, and my ground speed went up to 55mph (thanks to a 20mph tail wind).

I still see no difference in speed when wind is not a factor. I think many people think they're getting faster speeds, because ATTI isn't automatically correcting for any cross-wind component they're constantly exposed to (unless flying exactly into or with the wind), thus have more apparent speed in the direction they're moving in

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Flying in a tailwind or headwind situation, atti and GPS, the wind will have exactly the same effect.
When you push the right stick forward, the P3 goes forward as fast as it can In either mode and being carried by the wind, whatever mode it is in, its speed will be higher than in still air.
If it's in GPS mode, while going forward, it will not slow down to counter the wind.